Book excerpt: Explore the strange and shadowy side of the civil war . . . A fascinating collection of ghostly sightings, auspicious visions, audible manifestations, and uncanny premonitions. In 1872 a photographer who claimed he could capture the "essence' of dead relatives took an image purporting to show Mary Todd Lincoln with the protective ghost of Abraham Lincoln behind her. The spirit of George Washington who appeared to John C. Calhoun in the 1840s to persuade him not to dissolve the union. The nameless drummer boy from the Army of Ohio who still plays at the Shiloh battlefield The twentieth-century schoolchildren who heard the Irish brigade on the Antietam battlefield Teddy Roosevelt and First Lady Grace Coolidge who both claim to have enountered Abraham Linicoln in the White House Jefferson davis and his wife Varina who both have been seen at Fort Monroe, Virginia, where he was imprisoned after the War